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import numpy as np

1D ----> [1, 2, 3, 4, 5] ----> Axis 0
2D ----> [[1, 2, 3],
[4, 5, 6],
[7, 1, 0]] ----> Axis 1

Axis 1 is taken on upside of matrix pointing from left to right
Axis 0 is taken as from upside to downside of the matrix

For Example there is a matrix

matrix = np.zeros((3, 3))